40 Argon/ 39 Argon Dating of Pseudotachylyte from Cenozoic and Mesozoic Detachment Faults and Reverse-Sense Mylonite Zones, Southern California: Methodology and Interpretation

伪岩是一种断层岩类型，由破碎的围岩和熔体组成，可能是断层运动过程中高瞬态摩擦加热造成的。虽然这是非常复杂的材料，但从理论上讲，它确实提供了确定活动断层年代的可能性，假设它是在断层作用期间产生的，并且在假羟基酸盐形成期间某些辐射时钟系统被重置。该项目将通过研究几种同位素测年系统、理论扩散模型和使用天然和人工材料的校准技术来解决这个问题。研究结果有望帮助理解假羟基酸盐的形成，并为如何利用它来确定断层运动的年代提供见解

9814779Axen Pseudotachylyte is a type of fault rock consisting of a heterogeneous mixture of finely cominuted wall rock and melt likely caused by high transient frictional heating during fault movement. Although very complex material, it does theoretically offer the possibility of dating active faulting, assuming that it is produced during faulting and that some radiometric clock system is reset during pseudotachylyte formation. This project will address this problem by investigating several isotopic dating systems, theoretical diffusion models and calibration techniques using natural and artificial material. Results are expected to help understand pseudotachylyte formation and to provide insight into how it might be used to date fault movements.***